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LMX2531LQ1500E Datasheet(PDF) 3 Page - Texas Instruments |
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LMX2531LQ1500E Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 41 page  VCCDIG VregBUF 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 NC GND DATA CLK Fout GND GND VCCBUF Vtune CPout FLout VregPLL1 VCCPLL NC GND GND NC NC NC LMX2531 www.ti.com SNAS252R – OCTOBER 2005 – REVISED FEBRUARY 2013 Figure 2. 36-Pin WQFN Package, A Version (All Other Versions) PIN DESCRIPTIONS Pin # Pin Name I/O Description Power Supply for digital LDO circuitry. Input may range from 2.8 - 3.2 V. Bypass capacitors should be 1 VccDIG - placed as close as possible to this pin and ground. 3 GND - Ground 2,4,5,7, 12, 13, NC - No Connect. 29, 35 6 VregBUF - Internally regulated voltage for the VCO buffer circuitry. Connect to ground with a capacitor. MICROWIRE serial data input. High impedance CMOS input. This pin must not exceed 2.75V. Data is 8 DATA I clocked in MSB first. The last bits clocked in form the control or register select bits. MICROWIRE clock input. High impedance CMOS input. This pin must not exceed 2.75V. Data is clocked 9 CLK I into the shift register on the rising edge. MICROWIRE Latch Enable input. High impedance CMOS input. This pin must not exceed 2.75V. Data 10 LE I stored in the shift register is loaded into the selected latch register when LE goes HIGH. Chip Enable Input. High impedance CMOS input. This pin must not exceed 2.75V. When CE is brought high the LMX2531 is powered up corresponding to the internal power control bits. Although the part can be 11 CE I programmed when powered down, it is still necessary to reprogram the R0 register to get the part to re- lock. 14, 15 NC - No Connect. Do NOT ground. Power Supply for VCO regulator circuitry. Input may range from 2.8 - 3.2 V. Bypass capacitors should be 16 VccVCO - placed as close as possible to this pin and ground. Internally regulated voltage for VCO circuitry. Not intended to drive an external load. Connect to ground 17 VregVCO - with a capacitor and some series resistance. Internal reference voltage for VCO LDO. Not intended to drive an external load. Connect to ground with a 18 VrefVCO - capacitor. 19 GND - Ground for the VCO circuitry. 20 GND - Ground for the VCO Output Buffer circuitry. 21 Fout O Buffered RF Output for the VCO. Power Supply for the VCO Buffer circuitry. Input may range from 2.8 - 3.2 V. Bypass capacitors should be 22 VccBUF - placed as close as possible to this pin and ground. Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LMX2531 |
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